Organized 5 August 1895 in the California National Guard at Salinas as Troop C, Cavalry

Redesignated 1 May 1911 as Troop C, 1st Squadron of Cavalry

Mustered into Federal service 26 June 1916 at Sacramento; mustered out of Federal service 17 November 1916 at Los Angeles

Drafted into Federal service 5 August 1917

Reorganized and redesignated 3 October 1917 as Company B, 145th Machine Gun Battalion, an element of the 40th Division

Demobilized 20 May 1919 at the Presidio of San Francisco, California

Reorganized and Federally recognized 18 June 1924 in the California National Guard at Salinas as the 40th Tank Company and assigned to the 40th Division

Reorganized and redesignated 1 September 1940 as Company C, 194th Tank Battalion, and relieved from assignment to the 40th Division

Inducted into Federal service 10 February 1941 at Salinas

Surrendered 9 April 1942 to the Japanese 14th Army in the Philippine Islands

Inactivated 2 April 1946 in the Philippine Islands

Expanded and redesignated 21 June 1946 as the 199th Tank Battalion

Reorganized and Federally recognized 27 May 1947 in the California National Guard with Headquarters at Salinas

Reorganized and redesignated 1 February 1949 as the 149th Heavy Tank Battalion and assigned to the 49th Infantry Division

Reorganized and redesignated 1 September 1950 as the 149th Tank Battalion

Consolidated 1 May 1959 with the 170th Antiaircraft Artillery Battalion (see ANNEX 1) and consolidated unit reorganized and redesignated as the 149th Armor, a parent regiment under the Combat Arms Regimental System, to consist of the 1st Medium Tank Battalion and the 2d Reconnaissance Squadron, elements of the 49th Infantry Division

Reorganized 1 March 1963 to consist of the 1st and 3d Battalions, elements of the 49th Infantry Division, and the 4th Medium Tank Battalion

Reorganized 1 April 1964 to consist of the 1st and 3d Battalions, elements of the 49th Infantry Division, and the 4th Battalion

Reorganized 29 January 1968 to consist of the 1st Battalion

Reorganized 13 January 1974 to consist of the 1st Battalion, an element of the 40th Infantry Division

Withdrawn 19 January 1988 from the Combat Arms Regimental System and reorganized under the United States Army Regimental System

(1st Battalion ordered into active Federal service 1 May 1992 at home stations; released from active Federal service 9 May 1992 and reverted to state control)

(Location of Headquarters changed 1 June 1996 to the Presidio of Monterey; on
1 October 1999 to Seaside)

Ordered into active Federal service 14 August 2002 at home stations; released from active Federal service 2 September 2003 and reverted to state control

Redesignated 1 October 2005 as the 149th Armored Regiment

Consolidated 1 September 2007 with the 340th Support Battalion (see ANNEX 2) and consolidated unit designated as the 340th Support Battalion

ANNEX 1

Constituted 13 July 1946 in the California National Guard as the 118th Cavalry Reconnaissance Squadron, Mechanized

Organized and Federally recognized 8 June 1949 as the 118th Mechanized Cavalry Reconnaissance Squadron, with Headquarters at Red Bluff

Reorganized and redesignated 15 September 1959 as the 2d Battalion, 111th Armored Cavalry

Converted, reorganized, and redesignated 1 June 1954 as the 170th Antiaircraft Artillery Battalion

ANNEX 2

Organized 1 August 1985 from new and existing units in the California Army National Guard as the 3d Support Battalion, 40th Infantry Division Support Command; Headquarters organized and Federally recognized 3 September 1986 at San Lorenzo

Reorganized and redesignated 1 June 1987 as the 340th Support Battalion

(Headquarters ordered into active Federal service 8 September 2004; released from active Federal service 6 March 2006 and reverted to state control)